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Long-Term Debt - Additional Information (Details) - USD ($) |  |  |  |  |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 01, 2018 | Jul. 01, 2017 | Feb. 22, 2017 | Aug. 22, 2016 | Mar. 17, 2014 | Mar. 31, 2012 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2007 | Dec. 31, 2005 | Dec. 31, 2003
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Maturity period of Long-term advances, earliest |  |  |  |  |  |  | 2019 |  |  |  |  |
Maturity period of Long-term advances, new |  |  |  |  |  |  | 2030 |  |  |  |  |
Unused lines of credit |  |  |  |  |  |  | $ 3,301,543,000 |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  | 0 | $ 205,000 | $ 2,539,000 |  |  |
Subordinated notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Par percentage |  |  |  | 100.00% |  |  |  |  |  |  |  |
Redemption price percentage |  |  |  | 100.00% |  |  |  |  |  |  |  |
PHC Statutory Trust I |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  | 5.49% |  |  |  |  |  |  |
PHC Statutory Trust I | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  | 2.85% |  |  |  |  |  |  | 285.00%
PHC Statutory Trust II | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  |  | 187.00% |
Heritage Financial Statutory Trust I | Subordinated notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Redemption of debenture |  |  | $ 10,515,000 |  |  |  |  |  |  |  |  |
Aggregate principal amount |  |  | 10,310,000 |  |  |  |  |  |  |  |  |
Prepayment penalty |  |  | $ 205,000 |  |  |  |  |  |  |  |  |
Capital Bancorp Capital Trust I |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Fixed interest rate |  |  |  |  |  | 4.42% |  |  |  |  |  |
Junior subordinated notes |  |  |  |  |  |  | 106,045,000 |  |  |  |  |
Capital Bancorp Capital Trust I | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  | 1.50% |  |  |  | 150.00% |  |
First M&F Statutory Trust I |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Junior subordinated notes |  |  |  |  |  |  | $ 9,450,000 | 9,997,000 |  |  |  |
Interest rate of senior note |  |  |  |  |  |  | 4.18% |  |  |  |  |
First M&F Statutory Trust I | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  | 133.00% |  |  |  |  |
Brand Group Holdings Statutory Trust I | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 205.00% |  |  |  |  |  |  |  |  |  |  |
Brand Group Holdings Statutory Trust II | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 300.00% |  |  |  |  |  |  |  |  |  |  |
Brand Group Holdings Statutory Trust III | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 3.00% |  |  |  |  |  |  |  |  |  |  |
Brand Group Holdings Statutory Trust IV | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate | 375.00% |  |  |  |  |  |  |  |  |  |  |
Brand Group Holdings Statutory Trust |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Unamortized discount |  |  |  |  |  |  | $ 505,000 |  |  |  |  |
5.00% Subordinated Notes due 2026 | Subordinated notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of senior note |  |  |  | 5.00% |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 60,000,000 |  |  |  |  |  |  |  |
5.00% Subordinated Notes due 2026 | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 384.00% |  |
5.50% Subordinated Notes due 2031 | Subordinated notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of senior note |  |  |  | 5.50% |  |  |  |  |  |  |  |
Aggregate principal amount |  |  |  | $ 40,000,000 |  |  |  |  |  |  |  |
5.50% Subordinated Notes due 2031 | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  |  |  |  |  |  |  |  |  | 407.10% |  |
Metropolitan Notes | Subordinated notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of senior note |  | 6.50% |  |  |  |  |  |  |  |  |  |
Borrowings |  | $ 15,000,000 |  |  |  |  |  |  |  |  |  |
Metropolitan Notes | LIBOR |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Basis spread on variable rate |  | 554.50% |  |  |  |  |  |  |  |  |  |
Brand Notes | Subordinated notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate of senior note | 8.50% |  |  |  |  |  |  |  |  |  |  |
Borrowings | $ 30,000,000 |  |  |  |  |  |  |  |  |  |  |
Federal Home Loan Bank |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Extinguishment of debt, amount |  |  |  |  |  |  | $ 0 | $ 0 | 42,369,000 |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  | $ 2,539,000 |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term advances, interest rates |  |  |  |  |  |  | 1.09% |  |  |  |  |
Minimum | 5.00% Subordinated Notes due 2026 | LIBOR | Subordinated notes |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Variable rate threshold |  |  |  | 0.00% |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term advances, interest rates |  |  |  |  |  |  | 5.28% |  |  |  |  |
Weighted Average |  |  |  |  |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Long-term advances, interest rates |  |  |  |  |  |  | 3.28% | 3.33% |  |  |  |

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